[continued]
However, in Theravada Buddhism,
there is no “Source of All things”, there is no one thing, person, substance, or
anything whatsoever that is the “sole” origin, beginning, or source of the physical cosmos or any spiritual worlds that exist beyond/within the physical cosmos. The different elements that make up the physical cosmos interact with each other, and produce various combinations and configurations (planets, stars, animals, humans, etc), but there is no one “source” that is the ultimate origin of the (physical or non-physical) cosmos altogether.
Not even Nibbana, the “Highest Happiness/Joy” is the sole “source” of all things, as the Buddha revealed (to the shock and consternation of many of His disciples!) in
the Mulapariyaya Sutta, where the Buddha, speaking of Himself, the Tathagata, states:
The Tathagata — a worthy one, rightly self-awakened….directly knows Unbinding [that is, Nibbana] as Unbinding. Directly knowing Unbinding as Unbinding, he does not conceive things about Unbinding,
does not conceive things in Unbinding,
does not conceive things coming out of Unbinding, does not conceive Unbinding as ‘mine,’ does not delight in Unbinding. Why is that? Because the Tathagata has comprehended it to the end, I tell you.
In other words, Nibbana, the “Unbinding”, is so unlike anything else, so “transcendent” to anything else, that one can’t even speak of Nibbana as being the “source” of all things.
To think or imagine that “things com[e] out of the Unbinding” is to not understand what Nibbana is. Nibbana is
not the Creator, Source, Manifester, or “root” (the term used in the Sutta) of any “thing” whatsoever. There is no one Being (or “God”) that
is all things; and there is no Being (or “God”) that “manifests” as all beings.
So, no, Theravada Buddhism is not “pantheistic”: there is no “God-is-All” “God-is-that-which-manifests-as-All” teaching in the Theravada tradition. The Theravada Buddhist tradition categorically denies that.